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What is impulse sparkover voltage?
impulse sparkover voltage. The highest value of voltage attained by an impulse of a designated waveshape and polarity applied across the terminals of a gas tube prior to the flow of discharge current. Syn:surge or impulse breakdown voltage.
What is Dc sparkover voltage?
Sparkover voltage is the main characteristic defining a GDT. It is the voltage at which breakdown will occur between the electrodes when a slowly increasing voltage is applied to the component. It depends on the electrode spacing, the pressure, and the properties of the gas mixture and of the emissive substance.
How GDT works?
Essentially a voltage dependent switch, the GDT maintains a high impedance off-state until a voltage exceeds the device’s sparkover voltage. When the surge event subsides and the system voltage returns to normal levels, the GDT will reset into its high impedance (off) state.
What is a discharge tube?
A discharge tube is an electrical device in which current flow is by electrons and ions in an ionized gas, as in a fluorescent light or a neon tube. A discharge tube is an electrical device in which current flow is by electrons and ions in an ionized gas, as in a fluorescent light or a neon tube.
What is GDT circuit?
A Gas Discharge Tube or GDT can be used as a standalone component or combined with other components to make a multistage protection circuit – the gas tube acts as the high energy handling component.
What is the role of gas in discharge tube?
Gas discharge tubes dissipate voltage transients through a contained plasma gas. They have high insulation resistance plus low capacitance and leakage to ensure minimal effect on normal operation of equipment.
Where do we use discharge tube?
A specialized type of gas-filled tube called a Gas Discharge Tube (GDT) is fabricated for use as surge protectors, to limit voltage surges in electrical and electronic circuits.